Timing device for cam grinding machines



Oct. 29, 1935.

C. L. OTT

TIMING DEVICE FOR CAM GRINDING MACHINES Original Filed July 10, 1930 2Sheets-Sheet l mvzmon BY Conrad Loft A ORNEY Oct. 29, 1935. c 01-1-TIMING DEVICE FOR CAM GRINDING MACHINES Original Filed July 10, 1930 2Sheets-Sheet 2 IN VENTOR cmd L. 0H:

AT RNEY Patented Oct. 29, 1935 PATENT OFFICE 'rnumc DEVICE non CAMcamnmc MACHINES Conrad L. Ott, Waynesboro, Pa., assignor to Landis ToolCompany, Waynesboro, Pm, a corporation of Pennsylvania Application July10, 1930, Serial No. 467,045

. Renewed April 18,1932

. 23 Claims. (01. 51-72) This invention relates to devices for timingthe cate fluid circuitsto the several motors; 38 indigrinding of eachcam in a cam grinding machine and is designed primarily for use inmachines of the kind shown in the co-pending application of [.rAmos P.Steiner, Edgar P. -Wine, Conrad L. Ott and Harold E. Balsiger, SerialNo. 384,068, for

Cam grinding machines, filed August 7, 1929, and the object is toprovide an improved timing device which will be accurate and highlysensitive.

Referring to the accompanying drawings, which are madea part hereof andon which similar reference characters indicate similar parts,

Fig. 1 is a front view of an elevation of a cam grinding machine havingmy invention incorporated therein and Figure 2 is a view in elevation,partly in section,- of the device showing the fluid circuits and thevarious fluid motors somewhat diagrammat- V In the drawings numeral Iindicates a bar mounted on the traverse carriage of a grinding machineand II indicates a plunger adapted to seat in notches l2 in the bar tohold the traverse carriage'in the several operative positions necessaryfor grinding the several cams on a cam shaft.

The plunger II is attached to the rear end of a lever l3 which ispivoted on the base of the grinding machine at l4 and has a beveled endl5 adapted to engage a beveled lug IS on a cam ll. The lug I6 is beveledso as to permit the cam I! to rotate counterclockwise, said rotationcausing the leftend of a lever l3 to be raised to release the plunger Hfrom the notches l2. The cam I1 is mounted on a shaft I 8' andis rotatedthrough a series of gears I9, and a worm gear 2| mounted on a shaft 22.The end of the shaft 22 has a clutch 23 keyed thereto which clutch mayslide axiallyvon the shaft 22 to bring it into and out of engagementwith a'clutch 24 on shaft 25.. The shaft 25 is continuously rotated bymeans of a sprocket chain 26, said chain being driven by anysuitablemechanism on the grinding machine. Numeral 21 indicates the motor whichdrives the traverse carriage, 28 indicates the motor which moves thewheel base into and out of grinding position, 29 indicates the motorwhich moves the work supporting cradle toward-and from grinding wheel,30 indicates the reversing valve for the traverse carriage and 3|indicates the pump for supplying motive fluid to the several motors. Themotors just mentioned are similar in all respects to those shown in theco-pending application referred to and since no claim is made fornovelty in respect to them they wi not be -further described. 32, 33,34, 35,36 and 3"! indico-pending application referred to.

cates the control valve-for the motors. A plunger 3 39 having valvedisks 53 is'mounted to slide within the valve 38. The rear end of thelever l3 rests upon the upper end of the plunger 39. From 5 the view asshown it. will be apparent that the valve disk 53 controls passage offluid from the pressure line 32 into the line 40 through which fluid mayflow to the line 36 and'to each of the motors 28 and 29. Fluid willfirst flow through 10 the line 40 as it will be noted that the entranceto this line is slightlygabove the entrance tothe line 33 to operatewheel base and cradle before work can'iage. The wheel base and the workcradle therefore will move back as soon as the 16 plunger 39 is slightlydepressed. When the valve has been further depressed the line 33 .willbe opened so that the fluid may flow through this line through the valve30 to the line 34 or- 35 d pending on the position of the reverse valve4 0 to move the traverse carriage. Fluid also. will flow from the linethrough a restriction 42 to the line 4| and act against a valve 43 tomove this to the left against the tension of a spring 44. The tension ofthe spring is regulated by a nut 25 45. When the valve 43 has been movedsufliciently'far to the left fluid may flow from the line 4| into thechamber where it acts against-a piston 46 to move this to the left tomove clutch 23 out of engagement with clutch, 24 and stop rotation ofthe cam ll. 52 denotes-the work rotating motor and 5| a limit switchwhich controls the speed of the motor 52 so that at a predeter-- minedpoint in the grinding of a cam the work rotating motor is slowed downduring the polish- 35 l ing of a cam as is more fully described in theAt 50 is shown a latch by means of which the lever l3 may be held downso as to allow the traverse carriage to be freely reciprocated. 49denotes 40 the usual relief valve in the discharge line from the p'ump.v The operation of the invention is as follows: During grinding of a.cam the timing cam I1 is driven slowly through the gearing connectionde- 45 scribed. The speed'of this cam is timed so as to,

- permit the work to be completely ground during one revolution of caml1. When the lug I 6 strikes the beveled and I5 of the lever I 3, thelever is rocked on its pivot to release the plunger II from 6 engagementwith a notch on the bar ll'l. At the same time the valve 39 is depressedand pressure fluid line 32 is put into communication with pressure; line40 and through line 36 the wheel base and Work cradle are operated tomovethein 66 out of position so that the traverse carriage may be moved.As the disk 53.moves down further pressure line 32 is put intocommunication with line 33 to move the traverse carriage. Pressure fluidwould tend also to enter the line 4| to move back the valve 33 andrelease the clutches 23 and II. If there were no restriction at 42 thecam I! would be stopped at the instant that the valve plunger 33 ispressed down. This would stop the cam with the beveled end I! riding onthe top of the lug IS. A restriction at 42 is provided therefor so thatthe cam I! may move for a short time after the valve 39 is depressed.The size of the restriction 42 is such that the valve 43 will move backin time to cause the cam il to stop rotation at the instant the lug IIhas reached the position shown in the flgure. This s time may becontrolled by the tension lug nut 45.

When the traverse carriage reaches the position at which the plunger I Imay enter the next notch it is locked in this position. The plunger 39is moved to its upward position by means of a spring 5. when the plungeris moved again to lock the carriage in podtion the valve disk I3 movesup to shut of! pressure fluid from line 32 and to connect line II withthe exhaust line 48. As the valve 33 moves to the right chamber 55 isopened to exhaust port 41, spring I! then moves. piston 33 to the rightto bring clutch 23 into engagement with clutch 24. v

Itwiilbeobvioustothoseskiliedinthe art that various changes may be madein my device withoutdeparting from the spirit of the invention andtherefore I do not limit myself to what is shown in the drawings anddescribed in the specification, but only as indicated in the appendedclaims.

Having thus fully described my said invention, what I claim as new. anddesire to secure by Letters Patent, is:

I. In a grinding machine having a grinding wheel and a traversible workcarriage, and means for locking-the work carriage in work grindingposition, means for timing movement of the said carriage comprising acam, a constantly moving member, a clutch for-connecting said camoperatively with said constantly moving member, means for moving saidcarriage, and means for releasing said clutch after said carriage iscaused to move, substantially asset forth. I

2. In a cam grinding machine, a traverse carriage locking bar, a fluidmotor for moving said bar, Pressure fluid lines for operating saidmotor, means for locking the bar in any one of several predeterminedpositions to which it is moved, means for releasing said locking means,means operated by pressure from said fluid lines for making said meansinoperative, said motor being operated slightly in advance of said lastnamed means due to a restriction in the fluid line to said last namedmeans, substantially as set forth.

3. In a cam grinding machine having a notched bar for holding the cam tobe ground in any one of several predetermined positions, a fluid motormmoving said bar, a plunger engageable with the barto lock it inposition, a lever for operating said pllmger, a pressure fluid line tosaid motor, a

valve controlling fluid to said motor, said valve being operated by saidlever, a rotary cam having 1 ing for aaidlever to release the plungerfrom engagement with the said bar, a constantly driven shaft, a clutchoperatively connecting said shaft with means for rotating the cam, andmeans whereby when the said plunger is released from ,to stop rotationof the said cam, said-m the said bar the ma clutch will be v a causingoperation of said motor to start movement of said bar before rotation ofsaid cam is stopped, substantially as set forth. 5

4. In a cam grinding machine having a traverse carriage and operatingmeans for said carriage, means for locking the carriage in grindingposition, means for releasing the locking means for said carriage, meansfor timing the releasing 3 means to determine the time during which acam is ground, driving means for timing means, and means interruptingsaid driving means during movement of said carriage, there being a shortinterval between the'interruption of said driving 1- means for-thetiming means and the movement of the said traverse carriage,substantially as set forth.

5. A timing mechanism for a grinding machine comprising a timing cam,means for driving said i .cam comprising 'a constantly driven mechanisma connection between said cam and the said mechanism, means to render.said connection ing operation, substantially as set forth.

6. A timing mechanism for a grinding machine comprising a power driventiming cam, a connection between said cam and the source of power,

a control valve operated by said cam for controlling the movements ofthe machine, and means whereby said control valve operates to rendersaid connection operative or inoperative, substantially as set forth.

'7. Atimingmechanismforagrindingmachine. comprising a power driventiming cam, a connection between said cam and the driving means,

a control valve operated by said cam for controlling the' movements ofthe machine, means whereby said control valve operates to render saidconnection operative or inoperative, and means whereby said cam rotatesthrough a predetermined distance after said valve has been I shifted,substantially as set forth.

8. Atimingmechanismi'oragrindmgmachine comprising a power driven timingcam, a connection between said cam and the driving means. a controlvalve operated by said eam for cmtroiling the movements of the machine,meam whereby said control valve operates to render said connectionoperative orinoperative and a restriction between said valve and saidconnection to retard the opening of said connection, substantially asset forth.

9. The combination with the locking bar m a u carriage. a locking meanscooperating with said locking bar, of a tin ling device in control oi.Illll locking means, means for operating said timing device, means forinterrupting of the timing device at predetermined intervals, and Qmeans controlled by said timing device for causing movement ofsaidcarriage while said than device is inactive;

10.Inagrindingmachinehavingacarriage. means for moving it and means forlocking it .5 in successive predetermined positions, atimingdevice incontrol of said locking means, a fluid motor in control of said timingdevice and a valve in control of means for moving said carriage, saidvalve being operated by release of said locking 1 means, (i fluid motorbeing controlled by the said valve, substantially as set forth.1l.Inacamgrinding machinehavingawork carriage, a wheel carriage and awork cradle, hydraulic motors for efl'ecting movement of the car- 1riages and work cradle and means for locking the work carriage ingrinding position, a cam for controllingreleasing of said locking means,means for'operating said cam, a fluid motor in control of said means, arestriction in the fluid line to said motor, a fluid motor for operatingthe wheel carriage, the pressure fluid line to said motor being incommunication with the said first-named fluid motor, the said cam meanshaving means engageable locking means for causing withdrawal of thewheel base and the work cradle, the said restriction causing withdrawalof the wheel. carriage slightly in advance of indexing of the workcarriage,-substantialy as set forth.

12. In a cam grinding machine having means for operating a workcarriage, a work cradle and a wheel base, means for locking the workcarriage in successive positions-to locate a cam in grinding position, acam for releasing said looking means, means for operating said cam, afluid motor in control of said operating means, fluid motors foroperating the work carriage and the wheel base, and a restriction in thefluid line to theflrst named motor, said cam also causing operation ofthe said wheel base, work cradle and work carriage, the work cradle andwheel base being operated slightly in advance of operation of the workcarriage, substantially'as set forth.

13. Timing mechanism for a grinding machine comprising a timing cam,driving mechanism for said cam, a releasable connection between said camand said driving mechanism, means oper-' .ated by said cam forcontrolling the movement of the machine, and means whereby said controlmeans operates to render said connection effective or inefiective forintermittently controlling the rotation of said cam, substantially asset forth.

14. Timing mechanism for a grinding machine comprising a power driventiming cam, releasable connection between said cam and the driving.

means, means operated by said cam for controlling the movement of themachine, means whereby said controlling means operates to render saidconnection operative or inoperative for intermittently controlling therotation of said cam, and

means whereby said cam rotates through a predetermined distance aftersaid control means has operated, substantially as set forth.

15. A timing mechanism for a grinding machine comprising a power driventiming cam, a connection between said cam and the driving meanstherefor, control means operated by said cam for controlling movementsof the machine, means whereby said control means operates to render saidconnection operative or inoperative,

, and means for delaying operation ofsaid control means to delayoperation of said work carriage until after said wheel carriage hasmoved to the limit of its travel in a given direction, substantially asset forth.

16. In a cam grinding machine, a workcar- .riage, a wheel carriage, afluid motor for moving chine and the said timing cam, a clutch forconnecting and disconnecting said drivingconnection. and means operatingto disconnect said clutch whereby said timing mechanism is inoperativeduring traverse of said work carriage, substantially as setforth.

17. In a cam grinding machine, a work carriage, a wheel carriage, afluid motor for moving the wheel carriage toward and from the work, asecond fluid motor for traversing the work carriage past the grindingwheel, a bar having a plu-. 1o rality of spaced notches correspondingtothe cams on the shaft to be ground and adapted to receive a plunger tolock the carriage in place during the grinding of a cam, means fortiming the grinding operation comprising a rotatable timing cam,

means operated by said timing cam for releasing the locking plunger, adrive connection between operable mechanism on the machine and the saidtiming cam, and a clutch for connecting and disconnecting said drivingconnection, withdrawal of said plunger serving also to disconnect saidclutch whereby said timing cam is inoperative during traverse of saidwork carriage, substantially as set forth. I

18. In a cam grinding machine, a wheelbase, a work carriage, means fortraversing the work carriage, means for looking it in any one of a'plu--rality of predetermined positions, means for releasing the lockingmeans, a timing cam in control of said releasing means, means foroperating 80 said timing cam, and means for'rendering said timing caminoperative during the traverse of the said work'carriage, substantiallyas set forth.

19. In a cam grinding machine, a work carriage, a wheel base, a workcradle, meansfor 86 moving each of said mechanisms to operative andinoperative positions, means for indexing the work carriage to bringsuccessively the various cams into position before the grinding wheel,means for locking the carriage infixed grinding 40 position, a timingcam for controlling indexing of the work can'iage, and means forrendering said timing cam operative only when the work carriage, thewheel base and the work cradle all are in operative grinding position,substantially asset forth. 1

20. A cam grinding machine having a wheel base, a work carriage and awork cradle, each of which is. operated by a separate fluid motor, asingle valve in control of each of the fluid motors, 60 a timing cam incontrol of indexing of the work carriage, said timing cam controllingalso operation of the said valve, substantially as set forth.

21. A cam grinding machine having a wheel base, a work carriage and awork cradlexeach of which is operated by a separate fluid motor, asingle valve in control of each of the fluid motors, a timing cam incontrol of indexing of the work carriage, said timing cam controllingalso operation of the said valve, said valve being so arranged that atthe end of grinding a single shaft, fluid to the work carriage is cutoif and the work cradle and wheel base-are withdrawn to inoperativeposition, substantially as 'set forth.

22. In a cam grinding machine, a control valve having fluid connections,therefrom to operate a wheel base, work carriage, and work cradle, atiming cam for operating said valve, means to drive said timing cam,means for locking the work carriage-in correct position for grinding acam, means controlled by the said cam for releasing the locking means,and causing withdrawal of the

